diff --git a/abstract-specification/sections/06-other-clauses.adoc b/abstract-specification/sections/06-other-clauses.adoc
index 21a61637..a5979118 100644
--- a/abstract-specification/sections/06-other-clauses.adoc
+++ b/abstract-specification/sections/06-other-clauses.adoc
@@ -54,7 +54,7 @@ class ReferenceSystem {
     }
 class SpatialReferenceSystem {
        <<abstract>>
-       dimension = 1..3
+       dimension = 1..*
        applicableLocationTimeOrDomain 
     }
 class TemporalReferenceSystem {